Dwarves with the wood burning skill turn wood into either ash or charcoal at a wood furnace. Dwarves with high skill level accomplish these tasks more quickly. Typically a wood stockpile and a bar/block stockpile are placed near the furnaces.

Wood burner is somewhat tenuously considered a farming related job (because ash can be made into potash, which fertilizes fields) and thus the labor is filed under Farming/Related labor menu, and not Furnace Operating.